Here's the team that created Artifact :

1 Game designer/server-side programmer
1 Lead artist/character designer
1 Lead sound engineer/composer
1 Producer/project leader/client-side programmer

For our next project I'm estimating I need several more to get it done in a timely manner.

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DavidRM
Samu Games

Quaternion's team is:

1 lead
1/2 an artist

The size of the team isn't important. What's important is how the team functions together and whether you all have the same vision.

Mason McCuskey
Spin Studios
www.spin-studios.com

2.8 million dollar MMRPG project:

1 Producer
2 Graphics developers
1 Web developer
1 Server Side developer(producer being myself will help here)
2 3D Artists
2 Sound Artists
1 Marketing Cust Service Mgr
6 World Designers (Level builders)
1 Operations Manager
4 Systems Administrators/Help Desk personnel

It is interesting to note that the personnel choices are really based on your needs. The 4 sound and graphics guys are all well crosstrained so they can hold the load of art as a team. The art guys are responsible for creating the building blocks for zones while the world designers are responsible for scripting the world and assembling the final product through our custom world editor. Since a massive amount of content needs to be built, we were forced to take this approach or never finish the game. The same goes for the programmers. All 4 of them have cross disciplines that overlap and support eachother. Each has a specialty that provides additional strength to the team. This illustrates my approach to hiring as defined by the thread in General and Game Programming Discussion.

Kressilac